JPH0216278Y2 - - Google Patents

Description

[Detailed explanation of the invention] In this invention, a vehicle is placed on a roller stand installed in correspondence with the wheels of the vehicle, and the rotation of the roller stand puts the vehicle into a running state, thereby improving the suspension and various structures of the car body. This invention relates to a vehicle durability test device that tests the fatigue strength of parts.

B. Prior art Automobiles are tested in their completed state to examine the fatigue strength (durability) of each component, especially the suspension and vehicle body, under running conditions. This is done to verify that no harmful breakage or deformation will occur under load and stress conditions that are likely to be encountered by general users, and to determine the compatibility of each component.

For the above durability test, it is necessary to determine a driving environment that can simulate the usage conditions of general users in a short amount of time, and it is important that the product be subjected to higher frequency than normal under the harshest conditions that will actually be encountered. .

In conventional durability tests, in order to satisfy the above conditions, a test road with the most severe roughness of the road surface that can actually exist is formed, and the test road is actually driven on the test road for a long period of time. It was run continuously for a long time.

However, according to the above method, a large site is required to install the test track, and the equipment cost is high. Furthermore, it is necessary to maintain the same road surface condition for a long period of time, making maintenance difficult, and furthermore, it is not possible to provide road surfaces with different conditions.
Another problem was that the drivers were forced to work hard because they had to drive the cars continuously for long periods of time under harsh conditions.

Therefore, in order to solve the above-mentioned problem, a roller stand with an appropriate uneven pattern is placed corresponding to each wheel of the vehicle, the vehicle is placed on this roller stand, and the roller stand is actively rotated. Durability testing equipment has come into use that conducts tests while subjecting the vehicle to vibrations and driving conditions.

The above test device has the advantage that it does not require a large installation space, reduces equipment costs, and also improves the working conditions of the driver because unmanned operation is possible.

By the way, in the above-mentioned durability test equipment, it is usually necessary to include as much unevenness component of rough road as possible within the range that can actually exist in the unevenness pattern.
It is possible to match the correlation between the durability performance in actual driving and the durability in the test, improving the reliability of the test results. However, since this device rotates each wheel of the vehicle using a separate roller stand, the size of these roller stands is restricted, and the length of the circumferential surface thereof is shortened. Therefore, even if an uneven pattern simulating the most severe rough road that can actually exist is formed on the circumferential surface of each roller table, the range is narrow and the evaluation of the test results is sufficiently satisfactory. It wasn't something I could do.

(b) Purpose of the invention By making the period of excitation by the uneven pattern different between at least the front wheels and the rear wheels of the vehicle, it is possible to make a wide range of random vibrations to the vehicle even with the uneven pattern in a limited and narrow range, thereby achieving reliability. The purpose is to provide a test device that can obtain high evaluations of quality.

C. Structure of the invention The durability testing device in this invention includes a front wheel drive roller stand with an appropriate uneven pattern formed on its surface;
It is equipped with a rear wheel drive roller stand that rotates at a different rotational speed from the front wheel drive roller stand and has an appropriate uneven pattern formed on its surface.

The above durability test device rotates the front wheel drive roller stand and the rear wheel drive roller stand, rotates the front and rear wheels of the vehicle mounted on each roller stand, and at the same time rotates the uneven pattern formed on each roller stand. Durability tests can be performed by shaking the vehicle. Moreover, since the rotational speeds of the front wheel drive roller stand and the rear wheel drive roller stand are different, the timing of excitation to the vehicle can be shifted for each rotation without changing the uneven pattern of each roller stand. It is possible to perform a wide range of vibrations,
Furthermore, by changing the concavo-convex pattern, a variety of vibrations can be applied, making it possible to simulate any situation.

D Example Figure 1 is a side view showing the durability test device of the present invention.
Although only the left side of the vehicle is shown, the right side is also configured in the same way. In the figure, 1 is a vehicle to be tested for durability, and 2 and 3 are the front and rear wheels of the vehicle 1. Reference numerals 4 and 5 denote roller stands of an appropriate diameter, for example, approximately 1.4 m in diameter, which are provided at positions corresponding to the front and rear wheels 2 and 3 of the vehicle 1, and large-diameter driven pulleys are attached to the rotational shafts 6 and 7, respectively. 8 and 9 are fixed. The driven pulleys 8 and 9 have different diameters. The diameter of the driven pulley 8 provided on the front roller stand 4 is made slightly smaller than the diameter of the driven pulley 9 provided on the rear roller stand 5. It is designed to generate a rotation difference of 3%.
Reference numeral 10 denotes an electric motor that rotationally drives the roller tables 4 and 5, and a small diameter drive pulley 12 is attached to the output shaft 11 of this electric motor.
The drive pulley 12 and the driven pulleys 8, 9 are connected by belts 13, 14, etc. Therefore, when this electric motor 10 operates,
The front and rear roller stands 4 and 5 are driven to rotate simultaneously in the same direction via the driving pulley 12, belts 13 and 14, and driven pulleys 8 and 9, and due to the difference in diameter of both driven pulleys 8 and 9, the front and rear roller stands are driven to rotate simultaneously in the same direction. 4,5
It is rotated with a rotation difference of about 3%.
In this embodiment, both roller stands 4 and 5 are rotated clockwise to rotate both wheels 2 and 3 in the running direction.

A concavo-convex pattern 15 is formed on the surfaces of the roller stands 4 and 5, assuming a severe rough road. This uneven pattern 15 is formed by, for example, a plurality of substrates 16, 16 attached to the peripheral surfaces of the roller stands 4, 5, and cams 17, 1 of an appropriate height attached to each substrate 16.
It consists of 7... As shown in FIG. 2, the substrate 2 has an arcuate shape with an inner surface having the same curvature as the surfaces of the roller stands 4 and 5, and the outer periphery of the roller stands 4 and 5 is divided into a plurality of equal parts, for example, into eight parts. A plurality of, for example, five, pairs of cam mounting brackets 18 and 19 are mounted at equal intervals along the circumferential direction on both sides of the surface. The cam mounting brackets 18 and 19 are formed into a gate-shaped cross section, the lower surfaces of both ends thereof are formed into curved surfaces that match the surface of the board 16, and bolt holes 20, 20, 21 are provided at two longitudinal locations on the upper support surfaces 18a and 19a. , 21 are bored, their longitudinal directions are arranged along the circumferential direction of the substrate 16, and they are integrally connected to the substrate 16 by welding or the like. The cam 17 is formed with a rectangular box cross section, and has T-shaped flanges 2 at both ends.
2, 23 are integrally connected, and both end flanges 22, 2 are connected together.
3 are provided with bolt holes 24, 24, 25, 25. This cam 17 is mounted along the width direction of the board 16, and the flanges 22 and 23 at both ends are matched with the opposing cam mounting brackets 18 and 19, respectively, and each bolt hole 20, 20, 24, 24, 21,
Tighten and fix bolts (not shown) to 21, 25, and 25. Incidentally, the cam 17 is formed with vertical walls 17a having various heights. For example, various types are formed at 5 mm intervals up to a maximum of 50 mm. However, from the bottom surface of the cam 17 both end flanges 22, 23
Always keep the height constant.

Then, the substrate 1 is mounted on the surface of the roller stands 4 and 5.
6 and the cam 17, the uneven pattern 15 formed by these 16 and 17 simulates the most severe rough road that can actually exist on general roads, and allows the vehicle 1 to travel in a short amount of time. The patterns are combined to form a pattern that allows durability testing of each structural part of the suspension and vehicle body. For example, as shown in FIG. 3, in the first section 27 of the roller stands 4, 5 divided into eight, the substrate 16 is directly attached to the roller stands 4, 5, and the second section from the tip side is attached to the surface of the substrate 16. Cam mounting bracket 1
Install the cam 17 with a height of 25 mm between 8 and 19, and the cam 17 with a height of 15 mm and the cam 17 with a height of 25 mm behind this.
A cam 17 with a height of 40 mm is mounted between respective cam mounting brackets 18 and 19. In the second section 28, the roller stands 4 and 5 are attached to the board 16 via a support stand 26 of an appropriate height, and on the surface of the board 16 there is a bracket 15 mm in height between the second cam mounting brackets 18 and 19. Install cam 17,
Next, the third cam mounting bracket 18, 19
A cam 17 with a height of 25 mm is installed between them, and no cam 17 is installed in other locations. In the third section 29, the board 16 is attached to the roller stands 4 and 5 via the support stand 26 in the same manner as above, and on the surface of the board 16 there are installed brackets 18 and 19 for mounting the second and third cams, respectively. Install the 25mm cams 17, 17, then skip one place and install the fifth cam mounting bracket 18,
A cam 17 with a height of 15 mm is installed between 19 and no cam 17 is installed in other locations. 4th section 30
Then, the board 16 is directly attached to the roller stands 4 and 5, and the cam 17 with a height of 25 mm, the cam 17 with a height of 15 mm, and the 25mm cam 1
7. A cam 17 with a height of 50 mm and a cam 17 with a height of 40 mm are installed respectively. In the fifth section 31, the board 16 is attached to the roller stands 4 and 5 via the support stand 26, and the cam 17 with a height of 25 mm is attached to the third cam mounting brackets 18 and 19 on the surface of the board 16, and then 4th cam mounting bracket 1
Attach cams 17 with a height of 15 mm to 8 and 19, and do not install cams 17 at other locations. 6th section 32
In this case, the board 16 and cam 17 are not attached at all. In the seventh section 33, the board 16 is directly attached to the roller stands 4 and 5, and on the surface of the board 16, from the first cam mounting brackets 18 and 19 to the rear, a cam 17 with a height of 25 mm and a cam 17 with a height of 15 mm are installed. cam 1
7. Cam 17 with a height of 25 mm, cam 17 with a height of 40 mm,
A cam 17 with a height of 25 mm is installed respectively. In the eighth section 34, the board 16 and the cam 17 are not attached at all.

During the test, the front and rear wheels 2 and 3 of the vehicle 1 to be subjected to the durability test are placed on the roller stands 4 and 5 on which the uneven pattern 15 is formed as described above, and the vehicle 1 is careful not to jump out in the front-back direction or swing in the left-right direction. be restrained by appropriate means. Then, the electric motor 10 is operated with the gear of the vehicle 1 set to neutral. Then, the roller stands 4 and 5 rotate via the belts 13 and 14 and the driven pulleys 8 and 9, thereby rotating the front and rear wheels 2 and 3 of the vehicle 1 to bring them into a running state. The fatigue strength of each structural component of the suspension and the vehicle body is examined by frequently applying vibrations during driving on rough roads to the vehicle 1 via the front and rear wheels 2 and 3. During the above-mentioned vibration, since the rotational speeds of the front and rear roller tables 4, 5 are different, the period of vibration of the vehicle 1 by the roller tables 4, 5 is slightly different, so it is possible to perform random vibration with a lot of variation. This makes it possible to drive on a wide range of rough roads.

In the above embodiment, the front roller stand 4 and the rear roller stand 5 have different rotational speeds, but the rotational speeds of the left and right roller stands may also be different, and furthermore, the rotational speeds of all the roller stands may be different. may be made to be different.

E. Effects of the invention In this invention, among the plurality of roller stands that vibrate the vehicle, at least the front wheel drive roller stand and the rear wheel drive roller stand have different rotational speeds. Even if the uneven pattern is formed within a limited narrow range, the repetition period of the excitation pattern is slightly different for each roller table, so the period as the excitation pattern for the vehicle when combined is very large. It will be a long one. Therefore, it is possible to incorporate many vibration patterns within one cycle, allowing for a wide variety of random vibrations, which further improves the correlation between the durability performance in actual driving and the durability performance in the test. Good approximation is possible, and the reliability of evaluation of test results using this type of test equipment is greatly improved.

[Brief explanation of drawings]

Figure 1 is a side view of the durability test device according to the present invention;
FIG. 2 is a perspective view of a substrate and a cam forming an uneven pattern, and FIG. 3 is a developed view showing an example of an uneven pattern. 1... Vehicle, 2, 3... Wheel, 4, 5... Roller stand, 8, 9... Driven pulley, 10... Electric motor, 13, 14... Belt, 15... Uneven pattern, 16... Board, 17...cam.

Claims (1)

[Scope of utility model registration request] A front wheel drive roller stand having an appropriate unevenness pattern formed on its surface, and a rear wheel drive roller stand rotating at a rotation speed different from the front wheel driving roller stand and having an appropriate unevenness pattern formed on its surface. A vehicle durability testing device characterized by: